采用滑动测微计监测坝基岩体卸荷变形

Analysis on the Deformation in the Foundation Excavation of Xiaowan High Arch Dam

介绍了瑞士高精度滑动测微计监测沿钻孔中应变分布的原理和方法;采用滑动测微计成功监测了小湾坝基开挖及混凝土压重状态下的岩体卸荷变形,探测卸荷裂隙分布和张开位移量,定量分析了坝基卸荷岩体变形发展规律,为评价坝基岩体质量和调整坝基岩体力学参数提供了依据,可供类似工程参考。

This paper introduced the principle of the Swiss made sliding micrometer of high precision and its successful application to Xiaowan project in monitoring the deformation due to the rebounding heave in foundation excavation and the ensuing burdening of concrete. The scope of relaxation and distribution of deformation was obtained and the results were used to assess the quality of the rock foundation and adjust the parameters of the stability analysis of the arch dam.